- Thyroid disease encompasses various conditions occurring in the butterfly-shaped thyroid gland at the front of the neck, including abnormalities in thyroid hormone production, gland enlargement, nodules, inflammation, and cancer.
- Causes vary by disease and may involve autoimmune factors, genetic factors, inflammation, exposure to drugs or radiation, iodine status, or neoplastic changes.
- Since thyroid hormones regulate the body's energy usage and affect the function of almost all organs, having too much or too little hormone can alter various physiological functions.
- Representative clinical manifestations include fatigue, weight changes, heart rate changes, sensitivity to heat or cold, bowel movement changes, mood changes, and neck enlargement or nodules.
- Risks and prognosis may vary depending on age, sex, family history, autoimmune diseases, pregnancy/childbirth, exposure to drugs and radiation, and comorbidities.
- Symptoms can begin gradually or suddenly, ranging from asymptomatic findings to persistent hormone imbalance or structural changes, and the course varies depending on the disease type and response to treatment.
- Diagnosis is made based on medical history and physical examination, by performing thyroid function and related blood tests, and adding imaging tests or nodule biopsy if necessary.
- Test results must be interpreted along with symptoms, medications, pregnancy status, comorbidities, and the timing of the test; a single value alone cannot confirm the cause or severity of the disease.
- Management is determined by comprehensively considering the type and severity of the disease, symptoms, structural abnormalities, and individual circumstances; observation, medication, radioactive iodine therapy, or surgery may be considered.
- Treatment is not unified into a single standard and varies according to the cause and clinical presentation; currently in clinical practice, medications, radioactive iodine, and surgery are used depending on the disease.